|Botanical Name:||Glycine max|
Pioneer Hi-Bred International, Inc.
8305 NW 62nd Avenue
P.O. Box 7060
United States of America
Martin Fabrizius, Pioneer Hi-Bred International, Inc., Redwood Falls, United States of America
|Agent in Canada:||
Pioneer Hi-Bred Production LP
379 Springbank Ave.
P.O. Box 23040
|Grant of Rights Date:||2015-06-26|
|Date rights revoked:||2016-06-26|
Varieties used for comparison: 'HS18RYS13' and '91Y74'
Summary: '91Y81 flowers earlier than 'HS18RYS13. The plants of '91Y81 have a light tawny pubescence whereas those of 'HS18RYS13have a grey pubescence. When 50 % of the pods are ripe, the plants of '91Y81 are taller than those of the reference varieties. The seed shape of '91Y81 is elongate whereas it is spherical flattened for '91Y74 and spherical rounded for 'HS18RYS13. '91Y81 has a medium to large dark brown hilum whereas 'HS18RYS13 has a small imperfect black hilum. '91Y81 matures earlier than the reference varieties.
PLANT: oilseed type, indeterminate growth type, semi-erect growth habit, light tawny pubescence on middle third of main stem
HYPOCOTYL: strong intensity of anthocyanin colouration
LEAF: medium green colour, pointed ovate lateral leaflet
SEED: elongate, dull lustre, yellow ground colour of testa, 19.6 grams per 100 seed at 13 % moisture
HILUM: dark brown, medium to large, normal abscission layer
AGRONOMICS: 2975 heat unit rating
QUALITY CHARACTERISTICS: 39.6 % protein, 21.1 % oil
Origin & Breeding History: '91Y81 (experimental designations XB17V11, PH11109) is the result of a cross made in 2004 between '92M22 and 'XB19V06 in Puerto Rico. The modified single seed descent method and pedigree method were used to develop the variety. The F1-F2 generations were grown in Puerto Rico. The F3 was grown in Minnesota, USA and the F4 in Chili. The F5 generation onward were grown in Minnesota and advanced based on yield for single plants and progeny rows. Single plant purification occurred in 2008 in Minnesota. Wide area testing continued from 2009-2011 in the USA and Canada. Selection criteria included yield, maturity and resistance to Roundup branded herbicides, Phytophthora rot (Phytophthora megasperma f. sp. glycinea) and soybean cyst nematode (Heterodera glycines).
Tests & Trials: Test and trials for '91Y81 were conducted in Thamesford, Ontario during the 2012 growing season. Plots consisted of 2 rows with a row length of 4 metres and a row spacing of 76 cm. Each plot was sown with approximately 225 seeds. There were 3 replications per variety arranged in a RCB design. The measured characteristics were based on 30 measurements per variety. Mean differences were significant at the 5% probability level based on LSD values. Results were supported by the official technical examination report 201100195, purchased from the Plant Variety Protection Office, Beltsville, Maryland, USA.
Comparison tables for '91Y81' with reference varieties 'HS18RYS13' and '91Y74'
Flowering Date (days)
Plant height (cm)
Maturity Date (days)
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